Four-sided bookshelf

The ornamental design for a four-sided bookshelf, as shown and described.

FIG. 1 is an elevational view of one side of a four-sided bookshelf showing my new design, the sides not shown being identical thereto;

FIG. 2 is a top plan view thereof;

FIG. 3 is a bottom plan view thereof; and

FIG. 4 is a perspective view thereof.

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